<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>原型对象中this指向</title>
</head>
<body>
  <script>
    function Star (uname, age) {
      this.uname = uname
      this.age = age
    }

    var that
    Star.prototype.sing = function () {
      console.log('我会唱歌')
      that = this
    }
    var ldh = new Star('刘德华', 18)
    // 1. 在构造函数中,里面this指向的是对象实例 ldh
    ldh.sing()
    console.log(that === ldh)

    // 2.原型对象函数里面的this 指向的是 实例对象 ldh
  </script>
</body>
</html>